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We are redoing our basement. In some areas (bathroom and laundry room) I plan on putting tile down. The basement is dry and level. Can I attach the tile directly to the basement floor?

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What kind of tile? Vinyl, ceramic, etc? – TomG Oct 12 '11 at 2:38
Probably ceramic (12x12 or similar), something that can take foot traffic and is not too costly because it is just a basement. – Jon Raynor Oct 12 '11 at 16:35
You may want to consider installing an in-floor heating system to keep the floor warm in the winter. – RSMoser Oct 12 '11 at 17:34
@RSMoser - Good idea, although I am trying to keep costs down. There is baseboard heating installed already in the main room (which will be the kids playroom), but not in the bathroom. – Jon Raynor Oct 12 '11 at 19:01
@JonRaynor: We have a small baseboard in our bathroom and just always keep the door closed. If i could have floor heating, I would. – jberger Nov 19 '11 at 20:42
up vote 6 down vote accepted

Yes you can - and even if the floor is slightly irregular, your application of thinset can even the top layer and make it nice and solid and true.

Here's an example - my own basement (not done by me - in fact about to be removed by me - but still...) enter image description here

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I don't see why not.

It would be worth sealing the concrete to make it waterproof where you are going to tile, particularly as you are making a bathroom and laundry room where there'll be a high risk of water spillage.

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Schluter Systems recommends using DITRA between the concrete and tile, but of course they sell DITRA, so they are not impartial.

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Yes you can, I would add a modifier to the thinset (instead of water) to make it flexible and bond well.

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